[SwiftUI]Updating took more than 5 seconds！

The error is as follows：
Code Block 
PreviewUpdateTimedOutError: Updating took more than 5 seconds
Updating a preview from ContentView_Previews in ***.app (23150) took more than 5 seconds.

This is just a new "Hello world" project. It can't be previewed on a real device.

Somebody can help me?plz,orz,orz! I'm going crazy！！！

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MasonLeng
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Could you share a link to this Hello World demo project?

I am trying to build a minimal demo then submit it to radar.
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CatStudioApp
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https://developer.apple.com/videos/play/wwdc2020/10119/

this one in the video
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MasonLeng
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